Study on Preparation and Oxygen Evolution Reaction Performance of S,Mo Co-modified Cobalt-based Composites
GU Xiao, WANG Yijie, QIN Lina, PENG Xuan, DU Maozhan, SUN Lixian*, XU Fen*
Guangxi Key Laboratory of Information Materials & Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China
Abstract: Metal-organic frameworks (MOFs) are a promising class of catalysts due to their abundant metal sites, large specific surface area and tunable porous structure. However, the low electronic conductivity of most MOFs limits their application in electrocatalysis. In thiswork, a two-step synthesis method was used to construct Co-MOF composite catalysts. The sulfided cobalt metal-organic framework precursor was first prepared using a solvothermal method, followed by the introduction of Mo elements for structural modification using a hydrothermal reaction. The optimized Mo/S-Co-MOF catalyst exhibited the best OER catalytic performance, with an overpotential of 255 mV and a Tafel slope of 89 mV·dec-1 at a current density of 10 mA·cm-2, and maintained 89% catalytic activity after 40 h of continuous electrolysis. Superior to the electrocatalysts reported in the literature (CoMo LDH/CNTs), the overpotential was reduced by 11 mV. Moreover, the charge transfer resistance (Rct) was reduced by 3.04 Ω compared with that of the conventional Co-MOF catalysts, which proved that the S, Mo modification could modulate the electronic structure of Co and reduce the charge transfer resistance, thus accelerating the electron transport. Meanwhile, the strong interaction of CoMo bimetallic can effectively inhibit the electrolyte corrosion and enhance the oxygen precipitation activity and durability to some extent. This study provides a new idea for designing low-cost transition metal-based catalysts for electrolytic water.
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2026, Vol. 40 
